Desk lamp



FIG. 1 is a first perspective view of a desk lamp, showing my design.

FIG. 2 is a second perspective view thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a right side elevation view thereof.

FIG. 7 is a top plan view thereof.

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is an enlarged view of an area labeled 9 in FIG. 2 of the desk lamp.

The details shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a desk lamp, as shown and described. 